RISC-V: Fix regular expression in target-specific test

Some square brackets were missing escape characters, causing DejaGnu to
try and call a proc with the name "at".

gcc/testsuite/ChangeLog:
	* gcc.target/riscv/read-thread-pointer.c: Fix escaping on
	regular expression.

diff --git a/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c b/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
index 760f8ea..401fb42 100644 (file)
--- a/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
+++ b/gcc/testsuite/gcc.target/riscv/read-thread-pointer.c
@@ -4,4 +4,4 @@ void *get_tp()
 {
     return __builtin_thread_pointer ();
 }
-/* { dg-final { scan-assembler "mv\[ \t\]*[at][0-9]+,tp" } } */
+/* { dg-final { scan-assembler "mv\[ \t\]*\[at\]\[0-9\]+,tp" } } */